With the syscall common attrs support for link_create, add syscall common attrs support for xdp link_create in order to report the invalid target ifindex error and the underlying driver's error.
Signed-off-by: Leon Hwang <[email protected]> --- include/linux/netdevice.h | 3 ++- kernel/bpf/syscall.c | 2 +- net/core/dev.c | 6 +++++- 3 files changed, 8 insertions(+), 3 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 3cff2174dc03..4548b0fd824d 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -4417,7 +4417,8 @@ struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *d struct sk_buff *dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, struct netdev_queue *txq, int *ret); -int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog); +int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog, + struct bpf_verifier_log *log); u8 dev_xdp_prog_count(struct net_device *dev); int netif_xdp_propagate(struct net_device *dev, struct netdev_bpf *bpf); int dev_xdp_propagate(struct net_device *dev, struct netdev_bpf *bpf); diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 252b479937a4..e96d5f09486f 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -5921,7 +5921,7 @@ static int link_create(union bpf_attr *attr, bpfptr_t uattr, struct bpf_common_a break; #ifdef CONFIG_NET case BPF_PROG_TYPE_XDP: - ret = bpf_xdp_link_attach(attr, prog); + ret = bpf_xdp_link_attach(attr, prog, log); break; case BPF_PROG_TYPE_SCHED_CLS: if (attr->link_create.attach_type == BPF_TCX_INGRESS || diff --git a/net/core/dev.c b/net/core/dev.c index 18dc88990510..fdc1de21f358 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -97,6 +97,7 @@ #include <linux/kthread.h> #include <linux/bpf.h> #include <linux/bpf_trace.h> +#include <linux/bpf_verifier.h> #include <net/net_namespace.h> #include <net/sock.h> #include <net/busy_poll.h> @@ -10771,7 +10772,8 @@ static const struct bpf_link_ops bpf_xdp_link_lops = { .update_prog = bpf_xdp_link_update, }; -int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) +int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog, + struct bpf_verifier_log *log) { struct net *net = current->nsproxy->net_ns; struct bpf_link_primer link_primer; @@ -10784,6 +10786,7 @@ int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) dev = dev_get_by_index(net, attr->link_create.target_ifindex); if (!dev) { rtnl_unlock(); + bpf_log(log, "Invalid target_ifindex.\n"); return -EINVAL; } @@ -10812,6 +10815,7 @@ int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) if (err) { link->dev = NULL; bpf_link_cleanup(&link_primer); + bpf_log(log, extack._msg); trace_bpf_xdp_link_attach_failed(extack._msg); goto out_put_dev; } -- 2.55.0
